Based on the data provided, we can observe that the coin in question has had varying starting and closing prices in previous auctions. The conservation status of the coin is at a 70 (MBC-), indicating that it is not in perfect condition, but it is also not in the worst condition.

The average starting price of the coin in previous auctions has been 138.21 euros, while the average closing price has been 267.62 euros. Additionally, it has been auctioned a total of 16 times in the past, sold in 13 instances and not sold in 3 instances.

Considering the previous prices of the coin, its current conservation status, and the fact that it has sold in the majority of previous auctions, we could estimate a maximum purchase price around 250-300 euros. It is important to note that this is just an estimate and the final price may vary depending on the demand in the current auction.